ML19269F424
| ML19269F424 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/13/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Andognini G BOSTON EDISON CO. |
| References | |
| IEB-78-10, NUDOCS 7912210011 | |
| Download: ML19269F424 (2) | |
Text
b g
UNITED STATES
[Sn nro NUCLEAR REGULATORY COMMl5510N
[
REGION I o
031 PARK AVENUE 2
KING OF PRUSSt A. PENNSYLVANIA 19406
%,*****/
SEP 131979 Docket No. 50-293 Boston Edison Company M/C Nuclear ATTN: Mr. G. Carl Andognini, Manager Nuclear Operations Department 800 Boylston Street Boston, Massachusetts 02199 Gentlemen:
Subject:
Bergen-Patterson Hydraulic Shock Suppressor Accumulator Spring Coils
References:
(a)
IE Bulletin 78-10, dated June 27, 1978 (b)
Boston Edison Response to IEB 78-10 (BECo letter 78-148 dated August 9, 1978)
IE Bulletin 78-10 (Reference (a)) concerned observed corrosion and breakage of carbon steel accumulator springs utilized in Bergen-Patterson Hydraulic Shock Suppressors.
In your response to IEB 78-10 you stated that during the 1977 refuel outage one of these springs was discovered broken and one severely corroded.
You proposed replacing the remainder of the suspect springs during the regularly scheduled functional tests, a program which could take as long as twenty years.
Based upon the observed failure of the subject springs at your facility we have detennined that additional information is required to evaluate the adequacy of your actions relative to IEB 78-10.
Specifically, the Items 1-4 delineated below shall be addressed in a report to this office within 45 days of the date of this letter.
1.
What actions will be initiated if subsequent testing and/or inspection identifies continued or accelerated corrosion of accumulator springs?
2.
What rurveillance testing outside of refueling outage functional testing is likely to detect accumulator spring failure due to corrosion?
3.
What effect would a failed accumulator spring have on operability of snubbers?
2166 075 7 912210
e Boston Edison Company 2
SEP 131979 4.
What effect would corrosion products in hydraulic fluid have upon opera-bility of snubbers?
Sincerely, jda B yce H. Grier Director cc:
P. J. McGuire, Pilgrim Station Manager A. Z. Roisman, Natural Resources Defense Council 2166 076